Re: MACKIE PPM608 repair
IIRC, the "listed" power consumption is for a 1/4-1/3 rated-power-output with either pink or white noise. Somewhere, I have a Mackie PDF that explains this. It also explains that if one ran the same amp into a dummy load at full output power (sine wave test) and then measured consumption from the AC line, to expect input VA to exceed rated output power.
I found this rather odd, since it basically allows giving a nameplate rating lower than its actual consumption.
PWM amplifiers (so-called "class D" or "tripath") are essentially an SMPS whose output varies at an audio rate. Full switching amps, the ones with an SMPS feeding that PWM power section are quite efficient- on the order of 85-90+% overall, AC line to output terminals.
Imagine if a computer had a line-frequency transformer and linear regulators- they'd make a Prescott look tame.
Originally posted by mxslick
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I found this rather odd, since it basically allows giving a nameplate rating lower than its actual consumption.
PWM amplifiers (so-called "class D" or "tripath") are essentially an SMPS whose output varies at an audio rate. Full switching amps, the ones with an SMPS feeding that PWM power section are quite efficient- on the order of 85-90+% overall, AC line to output terminals.
Imagine if a computer had a line-frequency transformer and linear regulators- they'd make a Prescott look tame.
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